GRE
The number of pillows that Ann must sell for her net profit to be zero
20
$$x^{4}$$
$$y^{4}+1$$
$$x^{2}-7x$$
-7x+49
$$\frac{6a^{2}+12ab+6b^{2}}{a+b}$$
6((a+b)
$$(141)^{2}-(28)^{2}$$
$$(141-28)^{2}$$
$$\sqrt{x^{12}}-y$$
$$(x^{3}+\sqrt{y})(x^{3}-\sqrt{y})$$
$$(s+t)^{2}$$
$$s^{2}+t^{2}$$
y
3
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